This page explains how Adam Block (USATT# 63980)'s rating went from 1989 to 1961 at the 2022 Phoenix Open & Giant Round Robin held on 5 Feb 2022 - 6 Feb 2022. The links below take you to pages that describe various aspects of the rating processor.

The rating processor goes through 4 passes in order. The links take you to pages that provide detailed explanations of the calculations during each of the 4 passes.